MIC2224中文资料2MHz 600mA PWM Buck Converter w/DAC Input and 40mΩ Bypass Switch数据手册Microchip规格书

描述 Description

The MIC2224 is a high efficiency 2MHz PWM synchronous buck switching regulator optimized for powering 2.5G and 3G CDMA RF Power Amplifiers. The output voltage of MIC2224 can be dynamically adjusted with an external DAC to maximize PA efficiency versus required output power. When the PA requires the highest power, the DAC can be used to enable a low on-resistance, 40mΩ, bypass switch that powers the PA directly from the battery.The 2MHz PWM operation of MIC2224 allows the smallest possible components. It also allows the device to easily meet stringent W-CDMA VOUT response specifications. The MIC2224 operates from a 2.7V to 5.5V input, making it ideal for single cell Li-Ion applications. The device features built-in power MOSFETs that can supply up to 600mA of output current in PWM mode, or over 1A in bypass mode. The MIC2224 can operate with a maximum duty cycle of 100% for use in low-dropout conditions.

特性 Features

• 2.7V to 5.5V input voltage range
• DAC-adjustable output voltage down to 0.3V
• 600mA output current in PWM mode
• Internally protected 40mΩ bypass switch
• Allows direct connection of battery to load
• Over 95% efficient
• Fully integrated MOSFET switches
• Constant 2MHz PWM operation
• Internal soft-start
• 1% line and load regulation
•

简介

MIC2224属于开发板套件编程器的评估板-DC/DC与AC/DC（离线）SMPS。由制造生产的MIC2224评估板 - DC/DC 与 AC/DC（离线）SMPS该系列产品提供了一种方便的方法，可对开关模式电源转换所用的器件（包括 DC-DC 和 AC-DC 型）进行性能或特性评估。“稳压器”（包含内部电源开关装置）和“控制器”（设计为控制外部电源开关）之类的器件均包括在内。